Did Mayhew voluntarily waive his Miranda rights and were his statements voluntary?

Question

Mayhew killed his ex-girlfriend, her fiancé, and then abducted his daughter and took her across state lines. He shot an officer who stopped him for a minor traffic offense. He then fatally shot his daughter and shot himself. On the way to the hospital in an ambulance, Mayhew was administered Miranda warnings, waived his rights, and made incriminating statements to the police. The entire conversation in the ambulance was videotaped. Mayhew was in moderate pain during the interrogation as evidenced by grimaces and moans, but he never complained of pain analogous to "unbearable" discomfort. He complained of blood in the back of his throat. His eyes were closed when he was loaded onto the ambulance, prompting the paramedics to instruct him to open his eyes. The paramedics used a blood pressure cuff and an intravenous drip to treat him. He did not lose consciousness at any point during the ambulance ride, but he claims that he was generally confused at the time because of the days' traumatic events, as supported by the EMT report which noted Mayhew was "confused to time/place/surroundings." During interrogation he made a number of inquiries to the officers. A police lieutenant occasionally pulled Mayhew's oxygen mask down toward his lower lip and chin in an apparent effort to clearly hear his words. Each time the mask was removed, the medics returned the mask over Mayhew's mouth and nose. On two separate occasions the lieutenant, who was a trained emergency medical first responder, aided the paramedics. He was not intoxicated and had taken no prescription or illicit drugs. Many of his statements were couched in voluntary language, he coherently answered almost all of the questions posed, and he answered these questions with absolute accuracy.
What will be an ideal response?

Answer 1

Yes